Thanks for a great response…got many correct answers, including some first timers. Anirudh Baddepudi was the first one to come back with the correct answer. Also had correct answers from Adila Sebastian, Rajesh Thakur, Anshu Goyal and Anubhav Gupta.

Correct answer was the following:

9 – 5 = 4

6 / 3 = 2

7 + 1 = 8

To explain the answer to children, here is a video for the solution:

Hope you enjoyed the puzzle!